drivers/nvmem/stm32-bsec-optee-ta.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * OP-TEE STM32MP BSEC PTA interface, used by STM32 ROMEM driver
   4  *
   5  * Copyright (C) 2022, STMicroelectronics - All Rights Reserved
   6  */
   7
   8 #if IS_ENABLED(CONFIG_NVMEM_STM32_BSEC_OPTEE_TA)
   9 /**
  10  * stm32_bsec_optee_ta_open() - initialize the STM32 BSEC TA
  11  * @ctx: the OP-TEE context on success
  12  *
  13  * Return:
  14  *      On success, 0. On failure, -errno.
  15  */
  16 int stm32_bsec_optee_ta_open(struct tee_context **ctx);
  17
  18 /**
  19  * stm32_bsec_optee_ta_close() - release the STM32 BSEC TA
  20  * @ctx: the OP-TEE context
  21  *
  22  * This function used to clean the OP-TEE resources initialized in
  23  * stm32_bsec_optee_ta_open(); it can be used as callback to
  24  * devm_add_action_or_reset()
  25  */
  26 void stm32_bsec_optee_ta_close(void *ctx);
  27
  28 /**
  29  * stm32_bsec_optee_ta_read() - nvmem read access using TA client driver
  30  * @ctx: the OP-TEE context provided by stm32_bsec_optee_ta_open
  31  * @offset: nvmem offset
  32  * @buf: buffer to fill with nvem values
  33  * @bytes: number of bytes to read
  34  *
  35  * Return:
  36  *      On success, 0. On failure, -errno.
  37  */
  38 int stm32_bsec_optee_ta_read(struct tee_context *ctx, unsigned int offset,
  39                              void *buf, size_t bytes);
  40
  41 /**
  42  * stm32_bsec_optee_ta_write() - nvmem write access using TA client driver
  43  * @ctx: the OP-TEE context provided by stm32_bsec_optee_ta_open
  44  * @lower: number of lower OTP, not protected by ECC
  45  * @offset: nvmem offset
  46  * @buf: buffer with nvem values
  47  * @bytes: number of bytes to write
  48  *
  49  * Return:
  50  *      On success, 0. On failure, -errno.
  51  */
  52 int stm32_bsec_optee_ta_write(struct tee_context *ctx, unsigned int lower,
  53                               unsigned int offset, void *buf, size_t bytes);
  54
  55 #else
  56
  57 static inline int stm32_bsec_optee_ta_open(struct tee_context **ctx)
  58 {
  59         return -EOPNOTSUPP;
  60 }
  61
  62 static inline void stm32_bsec_optee_ta_close(void *ctx)
  63 {
  64 }
  65
  66 static inline int stm32_bsec_optee_ta_read(struct tee_context *ctx,
  67                                            unsigned int offset, void *buf,
  68                                            size_t bytes)
  69 {
  70         return -EOPNOTSUPP;
  71 }
  72
  73 static inline int stm32_bsec_optee_ta_write(struct tee_context *ctx,
  74                                             unsigned int lower,
  75                                             unsigned int offset, void *buf,
  76                                             size_t bytes)
  77 {
  78         return -EOPNOTSUPP;
  79 }
  80 #endif /* CONFIG_NVMEM_STM32_BSEC_OPTEE_TA */